Belt-tightener



n. n. ROBERTS.

BELT HGHTENER.

APPIICATION FILED 1ULY22, |920.

1,363,01 5. Emma Dec. 21, 1920.

DREW D. EGBERTS, OF PERRY, FLORIDA.

BELT-TIGHTENER.

Application iled July 22, 1920.

', tighteners.

The object of the invention is to provide a belt tightening device of such novel and peculiar construction and arrangementl of parts as to atford longitudinal and vertical adjustment in its parts as desired or as occasion may demand, whereby the belt-engaging rollers may be contracted andV ein panded with respect to one another and with respect to the belt pulleys.

A further object of the invention is to provide belt-tightening rollers of such novel and peculiar construction and arrangement of parts will afford means for lubricating the same during a belt-tightening operation, and to furnish special means for revolubly mounting the rollers in the roller frame so that the oil feeding may remain stationary during rotary movement of the rollers in a belt-tightening operation.

Various other objects, advantages and improved results are attainable in the manufacture and practical application of the invention.

In the accompanying drawings forming part of this application Figure l is an end view of a pair of shaft pulleys, partly broken away, showing the application of the invention in belt-tightening position.

Fig. 2 is a top view of the device as shown in Fig. 1.

Fig. 3 is a sectional view dotted line 3-3 Fig. l.

The same reference characters denote the same parts throughout the several views of the drawings.

In carrying out my invention, I employ a metal frame comprising two pair of longitudinal members l and 2 provided with holes 3 for bolts 4, one of the two members overlapping the other member so as to afford longitudinal adjustment of the frame between a pair of shaft pulleys 5. The outer ends of the members l and 2 are attached to vertical frame members 6 and 7, by means of taken on the Specification of Letters Patent.

Patented Dec. 21, 1920. Serial No. 398,143.

bolts 8, preferably central of the length of the vertical members 6 and 7, which are arraned in pairs so as to permit a belt 9 to wort therebetween. The members 6 and 7 are provided with holes l0 for mounting the belt rollers ll. All of these rollers being of the same construction only one of them will be described in detail. The tube or pipe member l2 of the roller has a closed end, and the other end thereof has an oil cup 13 attached thereto. The pipe member l2 of the roller device is iXed in the holes l0 of the vertical frame members 6 and 7 by means of nuts 14, washers l5 and screw bushw ings 16. A sleeve or cylindrical member 17 1s revolubly mounted on the pipe l2 between the bushings 16 so that the latter form thrust bearings for the sleeve member 17.

The pipe l2 has an oil duct 18 for lubri-l cating the sleeve. There are ball bearings 19 between the sleeve andthe pipe forming a lubricating space 20, and permitting lubrication of the thrust bearings as well as throughout the length of the sleeve.

It will be seen changed from one set of holes in the vertical frame members to another set of such holes so as to adjust the rollers relative to each other verticall and with dition of the belt for tightening the same.l

n order to give the rollers relative longitudinal adjustment, the longitudinal frame members are adjusted so as to vary the space between the vertical frame members.

It will be observed that the construction of the rollers affords a ball bearing lubrieating assembly which permits the rollers to be changed from one position to another by merely removing and replacing the nuts and washers without separating the pipe and the other roller sleeve, or removing the oil cups.

I do not wish to be understood as conlining material, nor to the number of rollers, nor to the application of the invention to any particular belts, but reserve the right to make such changes and variations in the manufacture and practical application of the invention as may come within the scope of the appended claim.

Having thus described my invention what l claim as new and desire to secure by Letters Patent is in a belt-tightening device, a frame apthat the rollers may be.

respect to theconf the invention to any particular size andv plied to outer edges of the belt, rollers spanning the outer face of the belt and comprising an oil-feeding pipe adjustably Secures to certain members of the :traine and lizwing in oil duet leading therefrom, a belt-bearang sleeve revolubly mounted on the pipe between said frame members, :ind an oil cup secured to one end of the pipe, seid adjust- 

